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vehicular traffic, or exists at moisture conditions above specified limits.. This <br />prohibition encompasses all foundation types, including the natural ground, all <br />prepared subgrades, whether in an excavation or on an embankment, and all <br />layers of previously placed and compacted earthfill which become the <br />foundations for successive layers of earthfill. <br />All material that freezes or has been subjected to freeze -thaw action, or has <br />dessicated, or has been excessively wetted during the construction work, or <br />during periods of temporary shutdowns, such as, but not limited to, nights, <br />holidays, weekends, or winter shutdowns or earthwork operations, shall be <br />removed to a depth that is acceptable to the Engineer and replaced with new <br />material. Alternatively, the material shall be thawed, dried, moisture conditioned, <br />reworked, and recompacted to the specified criteria before additional material is <br />placed. <br />8. The Engineer will determine when placement of fill shall cease due to cold <br />weather. The Engineer may elect to use average daily air temperatures, <br />and/or physical observation of the soils for this determination. <br />9. Bedrock Foundation Surfaces: <br />a. Prior to the first layer of earthfill being placed in contact with <br />bedrock, all bedrock surfaces within the area to receive fill shall be <br />cleaned of all loose and objectionable materials in an approved <br />manner by handwork, barring, picking, brooming, air jetting, or <br />other effective means. In no case shall the selected method result in <br />further loosening, deterioration or undermining of the surface being <br />cleaned. This includes the foot traffic during cleaning and over <br />prepared surfaces and methods of removing collected materials and <br />debris during cleaning so not to adversely impact the prepared <br />surface. The final 2 feet of excavation shall be conducted with <br />rubber tired equipment. No steel tracked or wheeled equipment shall <br />be allowed within 2 feet of the bedrock surface. <br />10. Vertical formation surfaces shall be not more than 3 feet in height, and <br />benches of sufficient width shall be provided as necessary so that the <br />average slope of any formation surface is not steeper than one horizontal to <br />two vertical. Resloping of formation surfaces shall be accomplished by the <br />method that results in the least damage to the formation left in place. <br />11. Formation protrusions that will prohibit the specified placement and <br />compaction of earthfill materials shall be removed as provided in Section <br />3123 16. The formation surface remaining after removal of protrusions shall <br />be cleaned, and all loose and objectionable material removed prior to <br />placement of the earthfill. <br />12. Key Trench and Foundation Surfaces: <br />The key trench and foundation shall be excavated to exposed firm <br />bedrock as outlined Section 31 23 16. Areas of soft or fractured <br />material within the key trench or bedrock foundations shall be over <br />NCCI Pit #1 Reservoir Liner - Technical Specifications Fill <br />312323 -3 <br />